KeyFilter.h

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// ======================================================================
//  KeyFilter.h
// ======================================================================
//                   This file is a part of the book 
//             "Qt 5.10 Professional programming with C++"
//                       http://qt-book.com
// ======================================================================
//  Copyright (c) 2017 by Max Schlee
// ======================================================================

#pragma once

#include <QtWidgets>

// ======================================================================
class KeyFilter : public QObject {
protected:
    bool eventFilter(QObject* pobj, QEvent* pe)
    {
        if (pe->type() == QEvent::KeyPress) {
            if (((QKeyEvent*)pe)->key() == Qt::Key_Z) {
                QKeyEvent keyEvent(QEvent::KeyPress, 
                                   Qt::Key_A, 
                                   Qt::NoModifier, 
                                   "A"
                                  );
                QApplication::sendEvent(pobj, &keyEvent);            
                return true;
            }
        }
        return false;
    }

public:
    KeyFilter(QObject* pobj = 0)
        : QObject(pobj)
    {
    }
};